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Service Manual
Microwave Oven
Model : KOG-38052S
KOG-38152S
KOG-38252S
DAEWOO ELECTRONICS CO., LTD.
PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE
EXPOSURE TO EXCESSIVE MICROWAVE ENERGY
(a) Do not operate or allow the oven to be operated with the door open.
(b) Make the following safety checks on all ovens to be serviced before activating the magnetron
or other microwave source, and make repairs as necessary: (1) Interlock operation, (2) proper
door closing, (3) seal and sealing surfaces (arcing, wear, and other damage), (4) damage to or
loosening of hinges and latches, (5) evidence of dropping or abuse.
(c) Before turning on microwave power for any service test or inspection within the microwave
generating compartments, check the magnetron, wave guide or transmission line, and cavity
for proper alignment, integrity, and connection.
(d) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave
generation and transmission systems shall be repaired, replaced, or adjusted by procedures
described in this manual before the oven is released to the owner.
(e) A microwave leakage check to verify compliance with the Federal Performance Standard
should be performed on each oven prior to release to the owner.
TABLE OF CONTENTS
PROPER USE AND SERVICE PRECAUTIONS.........................................................................................................3
SPECIFICATIONS........................................................................................................................................................4
FEATURES DIAGRAM.................................................................................................................................................5
INSTALLATION ............................................................................................................................................................6
OPERATION.................................................................................................................................................................7
MEASUREMENT OF THE MICROWAVE OUTPUT POWER ....................................................................................8
MICROWAVE RADIATION TEST................................................................................................................................9
WIRING DIAGRAM.....................................................................................................................................................10
CIRCUIT DESCRIPTION ...........................................................................................................................................12
PRECAUTIONS FOR DISASSEMBLY AND REPAIR...............................................................................................14
DISASSEMBLY AND ASSEMBLY.............................................................................................................................15
INTERLOCK MECHANISM........................................................................................................................................21
TROUBLE SHOOTING GUIDE..................................................................................................................................23
COMPONENT TEST PROCEDURE..........................................................................................................................25
SAFETY INTERLOCK CONTINUITY TEST ..............................................................................................................26
EXPLODED AND PARTS LIST..................................................................................................................................27
2
CAUTION : This Device is to be Serviced Only by Porperly Qualified Service Personnel. Consult the
Service Manual for Proper Service Procedures to Assure Continued Compliance with the
Federal Performance Standard for Microwave Ovens and for Precautions to be Taken to
Avoid Possible Exposure to Excessive Microwave Energy.
PROPER USE AND SERVICE PRECAUTIONS
1. For Safe Operation
Damage that allows the microwave energy (that cooks or heats the food) to escape will result in poor cooking
and may cause serious bodily injury to the operator.
IF ANY OF THE FOLLOWING CONDITIONS EXIST, OPERATOR MUST NOT USE THE APPLIANCE.
(Only a trained service personnel should make repairs.)
1) A broken door hinge.
2) A broken door viewing screen.
3) A broken front panel, oven cavity.
4) A loosened door lock.
5) A broken door lock.
The door seal area and oven cavity surface be kept clean.
No grease, soil or spatter should be allowed to build up on these surfaces or inside the oven.
DO NOT ATTEMPT TO OPERATE THIS APPLIANCE WITH THE DOOR OPEN. The microwave oven has
concealed switches to make sure the power is turned off when the door is opened. Do not attempt to defeat
them.
DO NOT ATTEMPT TO SERVICE THIS APPLIANCE UNTIL YOU HAVE READ THIS SERVICE MANUAL.
2. For Safe Service Procedures.
1) If the oven is operative prior to servicing, a microwave emission check should be performed prior to servicing
the oven.
2) If any ascertained oven unit is found to have excessive emission level 5mW/cm2, the service person should:
(a) inform the manufacturer, importer or assembler,
(b) repair the unit at no cost to the owner,
(c) attempt to ascertain the cause of the excessive leakage,
(d) tell the owner of the unit not to use the unit until the oven has been brought into compliance.
3) If the oven operates with the door open, the service person should tell the user not to operate the oven and
contact the manufacturer immediately.
CAUTION
MICROWAVE RADIATION
PERSONNEL SHOULD NOT BE EXPOSED TO THE MICROWAVE ENERGY WHICH MAY RADIATE
FROM THE MAGNETRON OR OTHER MICROWAVE GENERATING DEVICE IF IT IS IMPROPERLY
USED OR CONNECTED. ALL INPUT AND OUTPUT MICROWAVE CONNECTIONS, WAVEGUIDES,
FLANGES, AND GASKETS MUST BE SECURE. NEVER OPERATE THE DEVICE WITHOUT A
MICROWAVE ENERGY ABSORBING LOAD ATTACHED. NEVER LOOK INTO AN OPEN
WAVEGUIDE OR ANTENNA WHILE THE DEVICE IS ENERGIZED.
3
SPECIFICATIONS
Item Specification
POWER SUPPLY 230V~50HZ, SINGLE PHASE WITH EARTHING
MICROWAVE 1350 W
MICROWAVE GRILL 1050 W
COMBINATION 2350 W
MICROWAVE ENERGY OUTPUT 900 W
MICROWAVE FREQUENCY 2450 MHz
OUTSIDE DIMENSIONS (WXHXD) 495X382X289 mm
CAVITY DIMENSIONS (WXHXD) 320X330X225mm
NET WEIGHT 16.5 Kg
TIMER 35 min. DUAL SPEED
FUNCTION SELECTIONS MICROWAVE/GRILL/COMBINATION
MICROWAVE POWER LEVELS 3 LEVELS
* Specifications subject to change without notice.
495 382
274
289
4
FEATURES DIAGRAM
2 4 12 13 1
9
3
10
11
5 8
6 14
7
1 Saftey Interlock System.
2 Door Viewing Screen - Allows viewing of food, the screen is designed so that light can pass through,
but not the microwave.
3 Door Hook - When the door is closed, it will automatically shut. If the door is opened while the oven is
operating, the magnetron will immediately stop operating.
4 Oven Cavity
5 Door Seal - Door seal maintains the microwave energy within the oven cavity and prevents microwave leakage.
6 Glass Cooking Tray - Made of special heat resistant glass. Food in a proper receptacle is placed on
this tray for cooking.
7 Roller Guide - This must always be used for cooking together with the glass cooking tray.
8 Coupler - this fits over the shaft in the center of the oven's cavity floor. This is to remain in the oven
for all cooking.
9 Knob V.P.C - Used to select a microwave power level.
0 Knob Timer - Used in setting cooking time for all functions.
q Door Release Button - By pushing this button the latch system cut off all circuits and stops the oven
before the door is opened.
w Reflector (Insulator Heator)
e Heating Element
r Metal Rack
5
INSTALLATION
1. Steady, flat location.
This microwave oven should be set on a steady, flat surface.
2. Leave space behind and side.
All air vents should be kept a clearance. If all vents are covered during operation, the oven may overheat and,
eventually, cause oven failure.
3. Away from radio, and TV sets
Poor television reception and radio interference may result if the oven is located close to a TV, Radio, or
antenna, feeder and so on.
4. Away from heating appliances and water taps
Keep the oven away from hot air, steam or splash when choosing a place to position it, or the insulation might
be adversely affected and breakdowns occur.
5. Power supply